Turner Motorsports 2021+ BMW M3/M4 G8X Stainless Valved Catback Exhaust

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Tips: 4" Double Wall Slant Exhaust Tip W/ Polished Black Chrome
Sale price$1,727.36 Regular price$1,912.90


Here at Turner our mission was to amplify the G80/G82 with a proper catback exhaust system. To accomplish this goal, our engineers increased flow and delivered an exhaust system that captures the full unrestricted sound of the sonorous twin turbo inline-6 S58 engine. The increase in flow was gained from smooth flow path dual 3.0" stainless exhaust pipes that feed into one of the best designed mufflers on the market. Our engineers specifically designed the muffler with flow in mind to ensure that even with the exhaust valves closed, our muffler flows better and sounds better than the stock muffler. The best part of our Turner catback is the capability to control just how aggressive you want to your exhaust to sound, far beyond the point that the factory exhaust is able to perform. All of this plus the direct fitment and straight forward installation leads to our valved exhaust being the clear answer in your mission to find the best exhaust for your S58 powered G80 or G82. 

The G80 took the world by storm by breaking the mold of BMW's standard design language. With the G80 and G82, a whole new generation of M car owners emerged. At first people were hesitant about the larger more distinguished front grilles, but after the shock was gone the true glory of BMW's newest M cars began to shine. The G80 M3 and G82 M4 are incredibly capable cars out of the box and Turner's large range of upgrades means the sky is the limit. Give your G80 or G82 the aggressive exhaust note that you wanted from the factory with Turner Motorsport's G80 G82 Stainless Valved Catback Exhaust.

Part Design:

  • Turner In-house designed and engineered using FARO ARM laser scanning technology and SolidWorks 3D CAD modeling for precision fitment.
  • T304 Stainless Material in a natural finish - 1.25mm wall thickness, back purged and TIG-welded throughout
  • 3.0"OD Stainless Steel Mandrel Bent Tubing 
  • T304 Stainless Steel 12mm barbed exhaust hangers Tig-Welded in OE locations for precise fitment.​
  • Strategically placed slip joints provide the most adjustability to obtain perfect fitment
  • Valved Muffler:
    • Optimized for superior flow over OEM
    • T304 Stainless Steel
    • Utilizes factory valve control


  • Mid range torque and power increase 3600-4200 RPM
    • Torque gains: +14 ft/lbs @ 3850 RPM
    • Horsepower gains: +10 HP @ 3850 RPM
  • Smoother horsepower and torque delivery from 3000-6500 RPM ​

Kit Contents:

  • Dual 3" Stainless Exhaust piping from secondary cats.
  • X pipe replacing middle muffler sections for better sound, performance and weight savings.
  • Valved muffler utilizing oem style exhaust valves
  • Optional Turner Slant Cut or Straight Cut Exhaust tips - 3.0" Inlet, 4.0" Outlet 
  • Clamps and Hardware for an OEM+ install
  • Optional Exhaust Pipe Hanger Removal Pliers

Installation and Support:

- Click HERE for Installation Instructions -